package arch.chameleon.support.util;

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;

import org.apache.commons.codec.DecoderException;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.codec.binary.Hex;
import org.apache.commons.lang3.StringEscapeUtils;

/**
 * 编/解码工具
 * @author George
 *
 */
public class EncodeUtils {
	private static final String DEFAULT_URL_ENCODING = "UTF-8";

	private EncodeUtils(){}
	
	/**
	 * 十六进制(Hex)编码
	 * @param input
	 * @return
	 */
	public static String encodeHex(byte[] input) {
		return Hex.encodeHexString(input);
	}

	/**
	 *  十六进制(Hex)解码
	 * @param input
	 * @return
	 */
	public static byte[] decodeHex(String input) {
		try {
			return Hex.decodeHex(input.toCharArray());
		} catch (DecoderException e) {
			throw Exceptions.unchecked(e);
		}
	}

	/**
	 * Base64编码.
	 */
	/**
	 * @param input
	 * @return
	 */
	public static String encodeBase64(byte[] input) {
		return Base64.encodeBase64String(input);
	}


	/**
	 * Base64编码, URL安全(将Base64中的URL非法字符'+'和'/'转为'-'和'_', 见RFC3548)
	 * @param input
	 * @return
	 */
	public static String encodeUrlSafeBase64(byte[] input) {
		return Base64.encodeBase64URLSafeString(input);
	}


	/**
	 * Base64解码
	 * @param input
	 * @return
	 */
	public static byte[] decodeBase64(String input) {
		return Base64.decodeBase64(input);
	}

	/**
	 * Html 转码
	 * @param html
	 * @return
	 */
	public static String escapeHtml(String html) {
		return StringEscapeUtils.escapeHtml4(html);
	}

	/**
	 * Html 解码
	 * @param htmlEscaped
	 * @return
	 */
	public static String unescapeHtml(String htmlEscaped) {
		return StringEscapeUtils.unescapeHtml4(htmlEscaped);
	}


	/**
	 * Xml 转码
	 * @param xml
	 * @return
	 */
	public static String escapeXml(String xml) {
		return StringEscapeUtils.escapeXml(xml);
	}


	/**
	 * Xml 解码
	 * @param xmlEscaped
	 * @return
	 */
	public static String unescapeXml(String xmlEscaped) {
		return StringEscapeUtils.unescapeXml(xmlEscaped);
	}


	/**
	 * URL 编码, Encode默认为UTF-8
	 * @param part
	 * @return
	 */
	public static String urlEncode(String part) {
		try {
			return URLEncoder.encode(part, DEFAULT_URL_ENCODING);
		} catch (UnsupportedEncodingException e) {
			throw Exceptions.unchecked(e);
		}
	}


	/**
	 * URL 解码, Encode默认为UTF-8
	 * @param part
	 * @return
	 */
	public static String urlDecode(String part) {

		try {
			return URLDecoder.decode(part, DEFAULT_URL_ENCODING);
		} catch (UnsupportedEncodingException e) {
			throw Exceptions.unchecked(e);
		}
	}
}
